Doing a HNC course and my current module is hydraulics and pneumatics. Never done this before so not sure if my thinking is correct for this question. The handouts are a bit vague in places and I can't find anything relevant on the net. 1. The problem statement, all variables and given/known data What problems may occur if a pneumatic pipe is specified 1. Larger 2. Smaller. than the optimum value. 2. Relevant equations none 3. The attempt at a solution My notes go a bit into detail about what happens if the pipe is smaller - increased resistance to flow resulting in pressure drops which result in increased operation costs. The only thing stated for larger pipes is 'increased cost of installation'. I would have thought there was more than this ie, - to get the correct pressure/flow in the line, we'd have to increase the compressor output to compensate, so surely this would result in premature failure of the unit and cost of repair...or something like that. Any more ideas? Doesn't have to be complicated or involve calculations (as no stats are given). I've spent a while searching for sites with details and there's some with info on pipes sized too small, but none for pipes sized too big . Any help/pointers would be appreciated.